How to Play Kurodoko
Shade cells so numbered cells can "see" exactly that many white cells in their row and column. Shaded cells cannot touch, and all white cells stay connected.
Try it now — Easy 7x7 →The Rules
- Shade cells black so each numbered cell can see exactly that many white cells in its row and column (counting itself)
- Vision is blocked by a black cell — a number counts unshaded cells up to the next black cell in each direction
- Black cells cannot be horizontally or vertically adjacent to each other
- All unshaded cells must form a single connected region
Available in 3 sizes (5x5, 7x7, 10x10) and 3 difficulty levels (easy, normal, hard).
See It in Action
Shade cells so each number can see exactly that many white cells horizontally and vertically
How to Play
- A numbered cell with value "1" must have all four adjacent cells black (it can only see itself)
- Calculate vision: if a number has already seen N cells via prior placements, stop adding whites in its direction
- Use the non-adjacency rule: after shading a cell, its four neighbours cannot also be shaded
- Ensure all white cells remain connected after each shading decision
Pro Tips
Large numbers in small grids mean the numbered cell's row and column must be mostly unshaded
Numbered cells near the grid edge have fewer cells to see — their value must be small
If two numbered cells share a row or column, black cells between them can satisfy both simultaneously
Frequently Asked Questions
What is Kurodoko?
Kurodoko means "Where is Black?" Numbers in white cells tell you how many white cells that cell can see horizontally and vertically (including itself), up to the next black cell. Black cells cannot touch each other, and all white cells must be connected.
Choose Your Challenge
Start with easy to learn the rules, then progress to harder difficulties.